package com.though.utils.tools;

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Random;

/**
 * Created with IntelliJ IDEA.
 * User: Czh
 * Date: 2018/2/24
 * Time: 下午2:38
 */
public class QRCodeUtils {
    private static Logger logger = LoggerFactory.getLogger(QRCodeUtils.class);
    public static final String FORMAT = "JPG";
    private static final String CHARSET = "utf-8";
    private static final int QRCODE_SIZE = 300; // 二维码尺寸
    private static final int LOGO_WIDTH = 80; // LOGO宽度
    private static final int LOGO_HEIGHT = 80; // LOGO高度

    /***
     * 生成二维码图片
     * @Title: createImage
     * @param: @param content
     * @param: @param logoPath
     * @param: @param needCompress
     * @param: @return
     * @param: @throws Exception
     * @return: BufferedImage
     */
    private static BufferedImage createImage(String content, String logoPath, boolean needCompress) {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);

        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
            int width = bitMatrix.getWidth();
            int height = bitMatrix.getHeight();

            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            for (int x = 0; x < width; x++) {
                for (int y = 0; y < height; y++) {
                    image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
                }
            }
            if (!StringUtils.isEmpty(logoPath)) {
                insertImage(image, logoPath, needCompress); // 插入LOGO
            }
            return image;
        } catch (WriterException e) {
            e.printStackTrace();
        } catch (IOException e) {
            logger.error("LOGO图片文件未找到....");
            e.printStackTrace();
        }
        return null;
    }

    /***
     * 插入LOGO
     * @Title: insertImage
     * @param: @param source
     * @param: @param logoPath
     * @param: @param needCompress
     * @param: @throws Exception
     * @return: void
     * @throws FileNotFoundException
     */
    private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws IOException {
        File file = new File(logoPath);
        if (!file.exists()) {
            throw new FileNotFoundException("logo file not found.");
        }

        Image src = ImageIO.read(new File(logoPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        if (needCompress) { // 压缩LOGO
            if (width > LOGO_WIDTH) {
                width = LOGO_WIDTH;
            }
            if (height > LOGO_HEIGHT) {
                height = LOGO_HEIGHT;
            }

            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图
            g.dispose();
            src = image;
        }
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (QRCODE_SIZE - width) / 2;
        int y = (QRCODE_SIZE - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }

    /***
     * 创建文件夹
     * @Title: mkdirs
     * @param: @param destPath
     * @return: void
     */
    private static void mkdirs(String destPath) {
        File file = new File(destPath);
        if (!file.exists() && !file.isDirectory()) {
            file.mkdirs(); // mkdirs会自动创建多层目录,区别于mkdir
        }
    }

    /***
     * 生成二维码(内嵌LOGO),二维码文件名随机,文件名可能会有重复
     * @Title: encode
     * @param: @param content 内容
     * @param: @param logoPath LOGO地址
     * @param: @param destPath 存放目录
     * @param: @param needCompress 是否压缩LOGO
     * @param: @return
     * @param: @throws Exception
     * @return: String
     */
    public static String encode(String content, String logoPath, String destPath, boolean needCompress) {
        BufferedImage image = QRCodeUtils.createImage(content, logoPath, needCompress);
        mkdirs(destPath);
        String fileName = new Random().nextInt(99999999) + "." + FORMAT.toLowerCase();
        try {
            ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
        } catch (IOException e) {
            logger.error("写入二维码图片异常...");
            e.printStackTrace();
        }
        return fileName;
    }

    /***
     * 生成二维码(内嵌LOGO),调用者指定二维码文件名
     * @Title: encode
     * @param: @param content 内容
     * @param: @param logoPath LOGO地址
     * @param: @param destPath 存放目录
     * @param: @param fileName 二维码文件名
     * @param: @param needCompress 是否压缩LOGO
     * @param: @return
     * @param: @throws Exception
     * @return: String
     */
    public static String encode(String content, String logoPath, String destPath, String fileName, boolean needCompress) {
        BufferedImage image = QRCodeUtils.createImage(content, logoPath, needCompress);
        mkdirs(destPath);
        fileName = fileName.substring(0, fileName.indexOf(".") > 0 ? fileName.indexOf(".") : fileName.length()) + "." + FORMAT;
        try {
            ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
        } catch (IOException e) {
            logger.error("写入二维码图片异常...");
            e.printStackTrace();
        }
        return fileName;
    }

    /***
     * 生成二维码(内嵌LOGO)
     * @Title: encode
     * @param: @param content
     * @param: @param logoPath
     * @param: @param destPath
     * @param: @return
     * @param: @throws Exception
     * @return: String
     */
    public static String encode(String content, String logoPath, String destPath) throws Exception {
        return QRCodeUtils.encode(content, logoPath, destPath, false);
    }

    /***
     * 生成二维码
     * @Title: encode
     * @param: @param content 内容
     * @param: @param destPath 存储地址
     * @param: @param needCompress 是否压缩LOGO
     * @param: @return
     * @param: @throws Exception
     * @return: String
     */
    public static String encode(String content, String destPath, boolean needCompress) throws Exception {
        return QRCodeUtils.encode(content, null, destPath, needCompress);
    }

    /***
     * 生成二维码
     * @Title: encode
     * @param: @param content 内容
     * @param: @param destPath 存储地址
     * @param: @return
     * @param: @throws Exception
     * @return: String
     */
    public static String encode(String content, String destPath) throws Exception {
        return QRCodeUtils.encode(content, null, destPath, false);
    }

    /***
     * 生成二维码(内嵌LOGO)
     * @Title: encode
     * @param: @param content 内容
     * @param: @param logoPath LOGO地址
     * @param: @param output 输出流
     * @param: @param needCompress 是否压缩LOGO
     * @param: @throws Exception
     * @return: void
     */
    public static void encode(String content, String logoPath, OutputStream output, boolean needCompress) throws Exception {
        BufferedImage image = QRCodeUtils.createImage(content, logoPath, needCompress);
        ImageIO.write(image, FORMAT, output);
    }

    /***
     * 生成二维码
     * @Title: encode
     * @param: @param content
     * @param: @param output
     * @param: @throws Exception
     * @return: void
     */
    public static void encode(String content, OutputStream output) throws Exception {
        QRCodeUtils.encode(content, null, output, false);
    }

    /***
     * 解析二维码
     * @Title: decode
     * @param: @param file 二维码图片
     * @param: @return
     * @param: @throws Exception
     * @return: String
     */
    public static String decode(File file) {
        try {
            BufferedImage image = ImageIO.read(file);
            if (image == null) {
                return null;
            }

            BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
            Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
            hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
            Result result = new MultiFormatReader().decode(bitmap, hints);
            return result.getText();
        } catch (IOException e) {
            logger.error("读取二维码图片异常...");
            e.printStackTrace();
        } catch (NotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }

    /***
     * 解析二维码
     * @Title: decode
     * @param: @param path 二维码图片
     * @param: @return
     * @param: @throws Exception
     * @return: String
     */
    public static String decode(String path) {
        return QRCodeUtils.decode(new File(path));
    }

    public static void main(String[] args) {
        String text = QRCodeUtils.decode("/Users/though/Downloads/54940862.jpg");
        System.out.println(text);
//        String text = "http://m.baidu.com";
//        QRCodeUtils.encode(text, null, "/Users/though/Downloads", true); // 不含LOGO
//
//        QRCodeUtils.encode(text, "/Users/though/Downloads/app.jpg", "/Users/though/Downloads", true); // 包含LOGO, 不指定二维码图片名
//
//        QRCodeUtils.encode(text, "/Users/though/Downloads/app.jpg", "/Users/though/Downloads", "123", true); // 包含LOGO, 指定二维码名称
    }

}